Gas fired forced air flow air heating furnace



Nov. 10, 1953 R. c. JAYE ET AL. 2,658,504

GAS FIRED FORCED AIR FLOW AIR HEATING FURNACE Filed March 27, 1952 2Sheets-Sheet l fii: 38.1 I /5 u u Iv =I a0 .Hwhara 1 Jaye Jahn F Hzr'tzNov. 10, 1953 R. c. JAYE ET AL GAS FIRED FORCED AIR FLOW AIR HEATINGFURNACE 2 Sheets-sh 2 Filed Mar 27 r 4 r r I Patented Nov. 10, 1953 GASHRED'FOR'CED AIR'FLOW AIR HEATING FURNACE Richard C. Jaye and John :F.:Hirtz, Watertown, Wis, assignors to Syncromatic :(lorporation,Watertown, Wis., a corporation-of Wisconsin Application March '27, 1952,Serial'No. 2-7 8,91 2

Claims. 1

This invention relates to furnaces such as are commonly used in homeheating installations and has more particular reference to furnaces ofthe gas fired type.

in general, it is the object of this invention to provide 'a gas firedfurnace in which a unique construction and arrangement of its componentsachieves a heat transfer -.sur-face of relatively great area in anunusually compact unit.

According to this'invention, a relatively large heat transfer surfaceoccupying a minimum of space isobtained through the provisionof a seriesor bank of upright elongated relatively flat ductlike combustionchambers disposed in closely spaced relationship to one another, andover which the air to be heated is circulated. Another factorcontributing to the compactness of the furnace of this invention residesin the provision therein of an elongated gas burnerlfor each of theduct-like combustion chambers, the burners being mounted closelyadjacent to one another, in a bank, in the bottom of the furnace andhaving their burner sections projecting into the lower ends of thecombustion chambers to supply heat thereto.

Another object of this invention resides in the provision of cooperatingupper and lower bafiles for each of the duct-like combustion chambers,which define a tortuous passageway along which the combustion gasesrising in the combustion chambers must pass to reach a combustion gasdischarge port in the side of the air heating chamher. In thisconnection it is a further object of this invention to provide easyaccess from one end of the furnace, to the upper ends of the combustionchambers through the combustion gas discharge port in the air heating:chamber, to facilitate cleaning of the interiors :of the .combustionchambers.

More specifically it is a further object of this invention to provide areadily removable draft diverter connected .to the exteriorofztheair-heating chamber over the combustion gas discharge port therein insuch a manner as to detachably hold the uppermost ba'flles in properposition in their combustion chambers.

Still another object of this invention residesin the provision of aslanting bottom wall portion for the :air heating chamber which isdisposed opposite the air inlet port of the :air heating chamber to beimpi-nged by the air blown 'into the air heating chamber and thus cooledto a temperature preventing damage thereto by the heat of the burnersmounted in the space beneath said slanting -bottom Wall portion,

With the above and other objects .in view, which will appear as thedescription proceeds, this invention resides in the novel constructionand arrangement of parts substantially as hereinafter described, andmore particularly defined by the appended claims, it being understoodthat such changes in the precise embodiment of the hereinafter disclosedinvention may be made as come within the scopeof the claims.

The accompanying drawings illustrate one complete example of thephysical embodiment of the invention constructed in accordance 'with thebest mode so far devised for the practical application of the principlesthereof, and in which:

Figure 1 is a side view of the furnace of this invention, portions beingshown in section and other portions in elevation;

Figure 2 is across sectional view taken through Figure 1 along the planeof the line 22;

=Figure2A is a fragmentary sectional view taken through Figure 1 :alongthe plane of the line 2-A-2A and illustrating the bank of elongated gasburners;

Figure 3 is a vertical sectional view taken through Figure 1 along 'theplane of the line 3-3;

Figure 4 is a fragmentary perspective view showing portions of the upperends of two .combustion chambers at their areas of connection to theexhaust header, portions thereof bein broken away and shown in section;

Figure 5 is a fragmentary sectional view substantially corresponding tothe upper left hand cornerof the furnace shown in Figure 1 andillustrating the manner in which the upper 'bafiies in the combustionchambers, and the draft diverter which holds them in place, may beremoved to facilitate cleaning of the combustion chambers; and

Figure 6 is a view similar to Figure 5 but showing a slightly modifiedmanner of detachably holding the upper bafiles in place in thecombustion chambers.

Referring now particularly to the accompanying drawings in which likereference characters indicate like parts throughout the views,'thenumeral -5 generally designates the housing or outer shell of the gasfired furnace of this invention. The housing is generally of elongatedrectangu'lar :shape, as viewed in horizontal section, and has sheetmetal top and bottom walls 6 and 1 respectively, opposite relativelywide side walls 8 and relatively narrow front and rear walls 9 and M),respectively. The front of the-housing,

per se, is open except for narrow flanges ll bent inwardly from the sidewalls 8 and the top and bottom walls 6 and 1; and the front wall 9comprises a readily detachable cover overlying these flanges. When thecover is removed, therefore, access may be had to the entire front endportion of the housing interior.

The top wall 6 of the housing has three openings therein [3, I4 and I5.The opening [3 is a relatively small hole adjacent to the front end ofthe housing and provides for the discharge of combustion gases from thefurnace; the opening I5 is adjacent to the rear wall of the furnace andprovides an inlet through which air to be heated may enter the furnace;and the opening I4 is a relatively large hole in the intermediateportion of the top wall 6 and provides for the discharge of heated airfrom the furnace.

Upright front and rear partitions l1 and I8 extend across the narrowdimension of the housing' interior in spaced relation to the ends of thehousing and to one another to define a front compartment beneath thecombustion gas outlet l3, an intermediate compartment 2| beneath theheated air outlet l4, and a rear compartment 22 beneath the air inlet[5. The rear partition extends vertically the full height of thefurnace, and has a relatively large opening in its lower central portionto communicate the lower end portions of the intermediate and rearcompartments 2! and 22, respectively.

The front partition l1 has a transversely elongated opening 25 in theupper portion thereof, spaced a short distance from the top wall 6 ofthe housing, and providing an outlet for the intermediate compartment inaddition to the top outlet [4. Near its lower end, the front partitionhas a flame shield 26 thereon terminating a short distance above thebottom wall 1 of the furnace. The flame shield 26 may be an integralportion of the front partition I1, but as shown in Figures 1 and 3comprises a separate sheet metal plate detachably secured by screws tothe front partition at its junction with a diagonal wall portion 21which extends entirely across the narrow dimension of the interior ofthe housing and slants downwardly and rearwardly from the frontpartition at an angle of approximately degrees to the bottom wall 1 tojoin therewith on a line approximately half way between the front andrear partitions l1 and I8.

The slanting wall portion 21 actually comprises the forward portion ofthe bottom wall of an air heating chamber 29 located in the intermediatecompartment 2! and defined by the front and rear partitions incooperation with a pair of upright sheet metal walls 30 extending thefull height of the housing, and disposed longitudinally between thefront and rear partitions, each adjacent to but spaced from one of thesides of the housing. Though the opening 24 in the lower end portion ofthe rear partition I8 is confined to an area thereof between the uprightwalls 30, it will be seen that these latter walls cooperate with thesides 8 of the housing to provide insulative air spaces 32 in thefurnace at opposite sides of the upright air heating chamber 29 sincethese spaces have restricted communication with the bottom of the airchamber 29 as at 32 and with the heated air outlet [4 as at l4 and thusprovide for the circulation of relatively cool air over the side walls8.

It is also important to note that the slanting bottom wall portion 21 ofthe air heating chamher is directly opposite the o ening 24 in the 76 nm ers.-

rear partition [8, through which air to be heated is forced by a blower33 in the rear compartment 22 arranged to direct such air horizontallyagainst the inner surface of the slanting bottom wall portion 21. Aswill be seen later, the air thus blown against the slanting bottom wall21 of the air heating chamber cools the same'to a temperature precludingburn-out thereof.

It is understood, of course, that the air entering the rear compartment22 through the opening IS in the top wall of the housing is constrainedto flow through one or more filters 35 in the upper portion of the rearcompartment, ahead of the blower 33.

The air heating chamber 29 has a bank of relatively flat duct-likecombustion chambers 31 disposed therein in side-by-side relationship. Inthe relatively small furnace shown, there are four such combustionchambers, but it will be understood that any desired number thereof canbe employed and that the number of combustion chambers determine theheating capacity of the furnace. The lower front portions of theductlike combustion chambers are cut diagonally to .fit the slantingbottom wall portion 21 and are welded to the edges of appropriatelyshaped holes therein. Hence the space below the slanting wall portion 21provides an inlet header communicated with each combustion chamber; andthe Wall portion 21 holds the bottom of the combustion chambers withtheir wide sides 40 in spaced parallel relationship to one another andto the upright walls 30.

The upper end portions of the combustion chambers have openings in theirnarrow front sides through which they communicate with an exhaust header42 welded thereto. The header 42 thus coacts with the slanting wallportion 21 to hold the combustion chambers in proper spaced relation anda flange 43 surrounding the open front end of the header is secured tothe front partition I1 by screws 44. The screws 44 also serve todetachably hold a draft diverter 1| in place in the upper part of thecompartment 20 over the discharge port 25 and by projecting beyond theflange 43 directly outside the walls 30 hold the same against outwarddisplacement. T-hese screws 44 pass through flanges 12 extended from thesides of the draft diverter, the wall I1 and are threaded into the flang43.

Referring to Figures 1 and 2 it will be noted that the wide-flat sides40 of the combustion chambers lie longitudinally of the housing 5 andthat the narrow ends of the combustion chambers are spaced from thefront and rear partitions l1 and I8 respectively. Baflles 21' arpreferably secured in the spaces between the combustion chambers andbetween the outermost combustion chambers and the walls 30 to assurebetter distribution of the incoming air over the heatin surfaces. Thesebaffles also assist in holding the combustion chambers in proper spacedrelation.

It will be seen that the space beneath the slanting wall portion 21communicates with the lower portion of the front compartment 20 beneaththe lower edge of the flame shield 26; and that the upper ends of thecombustion chambers are communicated through the exhaust header 42 andthe discharge port 25 with the draft diverter 1| in the upper portion ofthe front compartment 20.

A bank of gas burners 46, one for each combustion chamber, is mounted inthe lower portion of the furnace to supply heat to the combus- Theburners illustrated are like those forming the subject matter of thecopending application of Richard ,C. Jaye and John F. Hirtz, Serial No.247,716 filed September 21,1951. As described in greater detail in saidcopending application, each of the gas burners comprises a straightburner section 41, a straight mixing tube 48, and a transverselyenlarged portion 49 intermediate and connecting the burner and mixingsections.

The bank of bas burners, of course, is mounted in the lower part of thefurnace with their burner sections 41 extending horizontally through themouths of the combustion chambers provided by the holes in the slantingbottom wall portion '21 to occupy the bottom portions of the combustionchambers, and are close enough together in the bank that their enlargedmedial sections '49 are closely adjacent to one another as shown best inFigure 2A. The purpose of this mounting is to facilitate the'lighting ofthe burners from a single pilot light 50 which may be located to haveits flame ignite gas issuing from the slit-like igniter port El of anyone of the burners. Since the igniter ports extend entirely across thetop of the transversely enlarged medial sections 49 of the burners andare in alignment with one another, they, in effect, provide a singleigniter port extending substantially continuously across the bank ofburners, to enable all of them to be ignited by the common pilot light50.

The mixing sections 48 of the burners extend forwardly through notchesin the lower edge of the flame shield 26 to connect with a supply header53 extending transversely across the lower portion of the frontcompartment 20. In the usual manner, the supply header 53 supports themixing sections of the burners while the rear or burner sections of theburners have studs 54 projecting from opposite sides thereof andreceived in V-shaped brackets 55 welded to the inner sides of thecombustion chambers and cooperating with the supply header to hold theelongated burners in a horizontal position in the furnace.

From the description thus far it will be apparent that the lower portionof the front compartment ,20 accommodates the fuel feeding means of thefurnace, while the upper portion of the front compartment 20 providesfor the discharge of combustion gases from the furnace through the draftdiverter H located therein. These upper and lower portions of the frontcompartment are separated from one another by an intermediate shelf-likepartition 51 extending transversely across the narrow dimension of thehousing and having its backand its ends secured to the partition wall I!and the "sides of the housing in any desired manner. The front edge ofthis shelf abuts a rearwardly bent transverse flap B struck from thecover, and V-shaped flanges 59 therein and on the upper flange ll of thehousing receive downwardly bent transverse hook-like flanges 60 on theadjacent portions of the cover to thus provide for detachably holdingthe cover in place over the open front of the housing.

Combustion air is supplied to the furnace as well as to the bank ofburners through a grill 62 formed in the lower portion of the cover l2,

beneath the shelf-likepartition 57; and the rearwardly struck flap 58leaves a single large cutout 63 in the cover, above the shelf 51 for apurpose now about to be described.

The combustion gases rising in each combustion chamber impinge theupwardly and rearwardly slanting 116g of a fixed "ba'file 64 therein tobe directed rearwardly of the upstanding leg 65 of the heme. The upright:leg '65, however, terminates a distanceshort of the top of thecombustion .chamber so that the combustion gases are constrained to howforwardly over its upper end to reach the exhaust port-25 in theair'hea'ting chamber.

The fixed bafile, however, cooperates with a bailie'BB readilydetac'hably mounted'in theupper end of each combustion chamber toprovide a tortuous passageway along which the gases must passbeforeentering :the exhaust header 42. The baille "66 has va vertical leg 67,extending downwardly fromth'e top wall ofthe combustion chamberintermediate the upright leg 65 of .the fixed battle and the exhaustheader 42, with its lower extremity resting in V-shaped brackets '63:secured to the opposite sides of the combustion chamber at itsinterior. The horizontal leg 69 of each detachable "ba'flle extendsforwardly'along the top wall of its combustion chamber and passesforwardl into the exhaust header '42 to lie flatwise along the upperside thereof. A rearwardly directed horizontal flange 7!) formed on thedraft diverter 'H clamps the horizontal legs of all of the bafliesagainst the upper side of the exhaustheader.

The upper end of the draft diverter extends through the outlet [3 in thetop wall of the housing to conduct combustion gases entering the draftdiverter from .the exhaust header 42 to'the exterior of the furnace. Asthe combustion gas enters the draft diverter, however, it is constrainedto flow downwardly around a baffle 13 in its interior and then upwardlyfor discharge from "the top of the furnace.

The purpose of the bafiie .73, of course, is given to prevent back draftfrom the stack or chimney from entering the upper ends of the combustionchambers and extinguishing the burners in their lower ends. .Any backdraft which is experienced 'is relieved through the open bottom of thedraft diverter and forwardly through the cut-out 83 in the front cover.

As long as the draft diverter remains in place the upper baffles 66 :inthe combustion chambers are 'held in their proper positions cooperatingwith the fixed baflies E4 to provide a tortuous passageway which must befollowed by the combustion gases before they can discharge into thedraft diverter for travel to the stack.

In order to maintain efficiency of heat transfer between the relativelylarge surfaces provided by the walls of the combustion chambers and theair blown into the air heating chamber by the blower 33, it is necessaryto clean the combustion chambers from time to time. This may be readilyaccomplished in the furnace of this invention by removal of the coverfrom the front of the furnace and detachment of the draft diverter H inthe manner illustrated in Figure 5. This, of course, frees thehorizontal legs of the upper baflie 66 so that they may be lifted out ofthe combustion chambers through the exhaust header 42, thereby providingaccess to the entire upper ends of thecombustion chambers for cleaningof the same.

If necessary, the lower portions of the combustion chambers may likewisebe cleaned, since access may be had thereto through the open front endof the furnace by removal of the flame shield 26 which normally blocksdetachment of the burners 46 from the supply header 53.

It will be noted that the V-shaped brackets 68 are so proportioned thatthey hold their bafiles in forwardly inclined positions when the draftdiverter is removed. This facilitates replacement of the baffles andtheir securement by the attachment of the draft diverter.

In the operation of the furnace it will be noted that the flames issuingfrom those portions of the burners beneath the slanting bottom wallportion 21 have a tendency to overheat the same, with the resultantdanger that the sheet metal from which it is made will soon burn out.Any damage to the slanting bottom wall portion 21 by heat is effectivelyprecluded through the arrangement described, since the relatively coolair to be heated is forcefully directed by the blower 33 horizontallyagainst the inner surface of the slanting bottom wall portion 21 to coolthe same. Such air is deflected upwardly along the exteriors of each ofthe combustion chambers, in the spaces therebetween, to be heated duringits passage toward the discharge opening 14 in the top of the airheating chamber.

It is also highly important to note the flat ductlike combustionchambers provide a relatively great heat transfer area for the furnaceof this invention, but permit an extremely compact arrangement of thecomponents comprising the furnace. At the same time the duct-likecombustion chambers have the advantage that they can be subassembled byattachment to the slanting bottom wall portion 2'! and the exhaustheader 42, with any desired number of combustion chambers in a bank,depending upon the size of the furnace and the heating requirements ofthe installation, it being understood that the size of the header andthe width of the wall 21 is determined by the number of combustionchambers in the bank.

Though the described manner of holding the upper baffles in place isundoubtedly to be preferred, the attachment shown in Figure 6 could beemployed if desired. In this case the horizontal leg of each baflle isseparately secured to the top of the exhaust header by screws I! accessto which is had upon removable of the draft diverter.

From the foregoing description taken together with the accompanyingdrawings it will be readily apparent to those skilled in the art thatthis invention provides an exceptionally compact gas fired furnace thehigh heating efficiency of which can be easily maintained by reason ofthe easy access to the combustion chambers for cleaning of the same.

What we claim as our invention is:

1. In a gas fired furnace: means defining an upright air heating chamberopen at its top and having opposite upright front and rear walls, saidchamber having a discharge port in an upper portion thereof, and one ofsaid walls having an air inlet port in the lower portion thereof; meansdefining a bottom wall for said air heating chamber having a substantialportion thereof slanting upwardly away from said wall having the inletport toward the wall of the chamber opposite thereto to provide a spacebeneath the air heating chamber along the entire underside of saidslanting bottom wall portion; a bank of vertically elongated relativelyflat duct-like combustion chambers mounted inside the air heatingchamber with their wide sides opposing but spaced from each other andtheir longitudinal median planes intersecting said designated walls ofthe air heating chamber, the lower end portions of the combustionchambers which lie adjacent to said slanting bottom wall portionterminating flush therewith and being secured thereto, said slantingbottom wall portion having a hole therein in line with each combustionchamber to provide an inlet thereto leading from said space beneath theair heating chamber; an exhaust header communicating the upper ends ofthe combustion chambers with the discharge port in the air heatingchamber; an elongated gas burner for each combustion chamber having aburner section and a transverse igniter port in an enlarged medialsection of the burner; means mounting said gas burners in the furnace,in a bank, with their enlarged medial sections in said space beneath theair heating chamber but adjacent to the underside of said slantingbottom wall portion, and their igniter ports in transverse alignment andcollectively extending substantially continuously across the bank ofburners, and with their burner sections projecting horizontally throughthe holes in the slanting bottom wall portion into the lower ends of thecombustion chambers; and a blower in the furnace arranged to blow air tobe heated horizontally into the lower portion of the air heating chamberthrough the air inlet port therein and against the inner surface of saidslanting bottom wall portion to cool the same and so that such air isdeflected upwardly thereby toward the open top of the air heatingchamber to be heated by contact with the exteriors of the combustionchambers during travel of the air upwardly through the air heatingchamber.

2. In a gas fired furnace: means defining an air heating chamber open atits top and having pairs of opposite upright fiat side walls, one ofsaid side walls having a discharge port in an upper portion thereof, andanother of said side walls having an air inlet port in the lower portionthereof; means defining a bottom wall for said heating chamber having asubstantial portion thereof slanting upwardly away from said other sidewall toward the side wall of the chamber opposite thereto so as toprovide a space in the furnace beneath the air heating chamber adjacentto the entire underside of said slanting bottom wall portion; a bank offlat duct-like combustion chambers mounted vertically inside the airheating chamber in flatwise adjacent spaced relation to one another andto the sides of the air heating chamber, with the fiat sides of thecombustion chambers substantially perpendicular to said other side walland the wall opposite thereto, the portions of the lower ends of thecombustion chambers which lie adjacent to said slanting bottom wallportion terminating flush therewith and being secured thereto; and saidslanting bottom wall portion having spaced holes therein each aligningwith one of said combustion chambers to provide an inlet thereto leadingfrom said space beneath the air heating chamber; an exhaust gas headercommunicating the upper ends of said combustion chambers with thedischarge port in the air heating chamber; an elongated gas burner foreach combustion chamber having a burner section and a transverse igniterport in an enlarged medial section of the burner; means mounting saidgas burners in the furnace, in a bank, with their enlarged medialsections in said space beneath the air heating chamber but adjacent tothe underside of said slanting bottom wall portion, and their igniterports in transverse alignment and collectively extending substantiallycontinuously across the bank of burners, and with 9.; their burnersections projectin horizontally through the holes in, the. slantingbottom, wall portion. into the lower. ends. of the. combustion chambers,said mountingmeansincluding brack ets securedto the. combustion chambersin their interiors and, upon. which. the extremities of the burnersectionsthereinrest; and a blower inthe furnace arranged. to-blow. air.to be heated horizontally intothe lower portion of the .air heatingchamber through. the air inlet port and: against the inner surface of.said slanting bottom wall portion to cool. the same and so that such.air is deflected upwardly. thereby toward the open top of the airheating chamber to. be heatedby contact with the exteriors of the.combustion chambers during travel; of the air upwardly through the airheating chamber.

3. In a gas. firedlfurnacez means defining an air heating chamber openat itsv top andhaving pairs of opposite upright flat side walls, one. ofsaid side walls having a discharge port in an upper portion the'reof.,'.and another of said side walls havingan air inlet port in the. lowerportion thereof; meansd'efi'ning a. bottom wallfor. said air heatingchamber having a substantial portion thereof slanting upwardly away fromsaid other side wall and joined with the side wall opposite thereto todefine. an obtuse. angle therewith, said slantingbottom wall portionproviding a space in the. furnace. beneath the air heating chamber.adjacent to the entire underside of said slanting bottom wall portion,and. said slanting bottom wall portion having. a series of spacedelongated holes therein extending. lengthwise towards said oppositeside. wall of the airheating chamber; a bank of elongated'relativelyflat duct-like combustion chambers supported on said slanting bottom'wall portion in an up right position in the air heating chamber with thelower portion of each communicating with said space beneath the airheating chamber through one of the holesin. the slanting bottom wallportion, the wide sides of' said combustion chambers extendinglengthwise between said other side wall and the wall opposite theretobut terminating in. spaced. relation thereto, and. each combustionchamber having an outlet. in its. upper portion which adjacent to theside wallhaving' the discharge port. therein; an exhaust headerconnecting the outlets of the combustion chambers with thedi'schargeport; elongated gas burners mounted in said space beneath theair heating chamber, one'adjacent to each. of said holes in saidslanting. bottom wall portion, said gas burners having burner sectionsextending horizontally through said holes and into the lower ends of thecombustion chambers, and having transversely aligning igniter ports inenlarged medial sections thereof collectively extending substantiallycontinuously across the bank ofburners; a flue gas diverter detaohablymounted on the exterior of the air heating chamber over the dischargeport therein and in open communication with said exhaust header toreceive combustion gases issuing from the combustion chambers; bafflemeans fixed inside each of said combustion chambers and extendingthereacross beneath its outlet in an upwardly inclined direction fordeflecting rising hot combustion gases away from the exhaust header; anda substantially L-shaped baffle inside the upper end portion of eachcombustion chamber and above the inclined baflle means therein, eachhaving a substantially horizontal leg clamped between portions of thedraft diverter and the than;

exhaust header to detachably hold the: L-shaped baffle in place in itscombustion chamber. with the substantially horizontal leg thereofadjacent to the top of the combustion chamber, and the verticalilegextending downwardly toward the inclined bafiie means but. terminating adistance therefrom, so thatsaid baffles cooperate to define a tortuouspassageway through which the hot combustion gases must pass to reach theexhaustheader.

4. The gas fired furnace set forth in claim 3 wherein the means forholding said detachable L -shaped bafiles in place in the combustionchambers further includes brackets fixed to'the combustion chambersontheirinteriors and upon which the lower ends of. the vertical legs ofthe baffles. rest.

5.. Ina-gas fired furnace: a housing; having a detachable front endwall; means. defining an upright. air heating chamber in said housing,said means including an upright partition spaced rearwardly of saiddetachable front end wall and having a discharge port in an upperportion thereof; an upright; combustion chamber inside the air heatingchamber; means communicating the upper end portion of said combustionchamber with said. space in front of the upright partition through. thedischarge port therein, said last. named means including a substantiallyhorizontal wall portion fixed with respect to the combustion chamber andextending forwardly therefrom to said partition to define atop wallforsaid communicatingv means; duct. means detachably mounted on saidpartition in the space in front of it and communicated with thecombustion chamber, through said discharge port in thepartition, toreceive combustion gases from the combustion chamber, said duct meanshaving its upper portion opening to the exterior of the housing throughan opening in the top thereof; alower baffle mounted inside thecombustion chamber and extending upwardly and. rearwardly from the frontthereof; an upper substantially L-shaped baflie in the top of thecombustion'chamber having a substantially horizontal leg underlying andcontiguous to said fixed wall portion on" the combustion: chamber, and asubstantially'vertioal leg, extending downwardly. therefrom a distancerearwardly of said discharge. port; and means detachably holdingsaid-upper baiilein place in the combustioncharm ber,.inc1udinga flangeon said duct means cooperating with said fixed wall portiononthecombustion chamber to confinev aportion of the substantiallyhorizontal leg of the upper baffle therebetween.

6. The gas fired furnace of claim 5, wherein said' means detachabl'yholding the upper baffle in place in the combustion chamber includesbracket means on the. combustion chamber in which the lower'end of saidvertical leg of the upper baflie rests.

7. In a gas fired furnace: an elongated housing having top and bottomwalls and upright opposite wide sides and narrow front and back ends;spaced upright front and rear transverse partitions defining front,intermediate and rear compartments in the interior of the housing, thelower portion of the front partition slanting downwardly and rearwardlyto the bottom of the housing; a pair of upright longitudinal walls insaid intermediate compartment spaced from the sides of the housing andcooperating with the partitions to define an upright air heating chamberin the intermediate compartment spaced from the 11 housing sides, theair heating chamber having an air inlet port therein substantiallyhorizontally opposite said downwardly and. rearwardly slanting portionof the front partition, and said air heating chamber opening to theexterior of the housing through an opening in its top wall; a bank ofvertically elongated relatively flat ductlike combustion chambersmounted on said slanting portion of the front partition with their lowerfront ends terminating flush therewith in line with access holestherein; the front partition having an opening in its upper portionproviding a discharge port for the combustion chambers adjacent to theirupper ends; an exhaust header communicating the upper ends of thecombustion chambers with said discharge port; means in the upper portionof the front compartment for receiving the combustion gases issuing fromsaid discharge port and for conducting the same to a stack; an elongatedgas burner for each combustion chamber, said burners having burnersections extending horizontally rearwardly through the access holes insaid slanting portion of the front partition, from the spacetherebeneath, into the lower ends of the combustion chambers; and ablower in the lower portion of the rear compartment arranged to blow airto be heated horizontally forwardly through the air inlet port in theair heating chamber against the inner surface of the slanting portion ofsaid front partition to 0001 the same, such air being deflected upwardlythereby to be heated by contact with the exteriors of the combustionchambers during its upward travel therebetween.

8. In a gas fired furnace: an elongated boxlike housing having adetachable front wall; front and rear transverse partition dividing theinterior of the housing into upright front, intermediate and rearcompartments opening to the exterior of the housing through holes in thetop thereof, the lower portion of the front partition slantingdownwardly and rearwardly to the bottom of the housing; a pair ofupright longitudinal walls in said intermediate compartment cooperatingwith the partitions to define an upright air heating chamber in theintermediate compartment spaced from the housing sides and having an airinlet port in its lower portion opposite said downwardly and rearwardlyslanting portion of the front partition; a bank of spaced apart,vertically elongated duct-like combustion chambers mounted in the airheating chamber on said slanting portion of the front partition with thefronts of their lower ends terminating flush therewith and openingthrough holes therein to the space beneath said slanting portion of thefront partition; an exhaust header connected with the upper ends of thecombustion chambers and opening through the front partition to the frontcompartment; a duct-like draft diverter 12 l detachably mounted on thefront partition in the compartment and communicating with the exhaustheader to receive combustion gase therefrom, the open upper end of saidduct-like draft diverter extending through one of the holes in the topof the housing; a substantially L-shaped baflle for each combustionchamber; means mounting said baflles in their respective combustionchambers with one leg of each extending substantially horizontallyrearwardly along the upper end of its combustion chamber, and the otherleg thereof extending substantially vertically downwardly a distancerearwardly of the exhaust header, said mounting means including a flangeon the draft diverter clamping the horizontal legs of the bafilesagainst the exhaust header; a separate gas burner for each combustionchamber mounted beneath the front partition and having a burner sectionextending horizontally rearwardly through one of the holes in saidslanting portion of the front partition into the lower end of one of thecombustion chambers; and a blower in the lower portion of the rearcompartment for blowing air to be heated horizontally forwardly throughthe air inlet port in the air heating chamber and against the innersurface of the slanting portion of the front partition to cool the same.

9. The gas fired furnace set forth in claim 8 further characterized bythe fact that the detachable front wall for the furnace has an air ventin a medial portion thereof adjacent to the lower end of the draftdiverter; and cooperating means on the housing and said detachable frontwall, beneath said air vent, for isolating the upper portion of thefront compartment from the lower portion thereof.

10. The gas fired furnace set forth in claim 8 further characterized bythe provision of a stationary bafile mounted in each of the combustionchambers beneath the L-shaped baflie therein and extending rearwardlyand upwardly from the front of the combustion chamber beyond the planeof the vertically extending leg of the L- shaped baffle and above thelevel of the lower end of said L-shaped baffle to thus cooperatetherewith to define a tortuous passageway along which the combustiongases must travel for discharge through the exhaust header.

RICHARD C. JAYE. J. F. HIRTZ.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,756,737 Gamble Apr. 29, 1930 1,948,156 Ashley Feb. 20, 19342,011,753 Cornelius Aug. 20, 1935 2,292,180 Tuck Aug. 4, 1942 2,313,933

Georg Mar. 16, 1943

